Alec Baldwin has reprised in his role as Donald Trump for the latest episode of Saturday Night Live’s Weekend Update, identifying the US president as the true martyr of the tragic Charlottesville rally.

A 12-year-old singing ventriloquist has been awarded US$1 (A$1.3) million prize and her own Las Vegas show after taking the America's Got Talent crown on the season 12 finale of the NBC reality competition.

Russia's Supreme Court on Thursday issued a ruling banning Jehovah's Witnesses after the justice ministry called on it to dissolve the "extremist organisation".

Supreme Court judge Yury Ivanenko said Russia had decided to close down "the administrative centre of Jehovah's Witnesses and the local organisations in its fold and turn their property over to the Russian Federation".

The decision comes after the ministry said it had found signs of "extremist activity" within the organisation and requested that it be banned.

"They represent a threat to the rights of people, public order and public safety," Russian news agencies quoted justice ministry representative Svetlana Borisova as saying.

The group, which has 395 centres across Russia, has vowed to appeal the decision.